Acid/base-sensitive ring-opening metathesis polymers based on phenanthroimidazole dyes

摘要

Poly(norbornenes) with pendant 2-phenyl-1H-phenanthro9,1.0-dimidazole in different ratios were prepared and their photophysical properties were studied in the presence and absence of acids. The polymers exhibited good film-forming properties, which paved the way to study their acid/base-sensitivity in the solid state. Polymer films with a high fluorophore content exhibited self-absorption in their non-protonated form and a pronounced fluorescence response in the presence of gaseous HCl. In contrast, thin films of the polymer with a low dye content showed almost no self-absorption and only a poor response to the acidic analyte. GRAPHICS